Argentina's YPF Boosts Shale-Oil Estimate

BUENOS AIRES—Argentina's largest oil-and-gas company, YPF SA, has sharply raised its estimate for its unconventional oil-and-gas resources to 22.8 billion barrels from 927 million barrels.

The shale-oil finds have the potential to dramatically boost Argentina's status as an oil producer and exporter, as well as providing a new source of economic growth. They should also catapult YPF, which is majority-owned by Spain's Repsol YPF SA,...